如何在完成编辑文本字段时关闭键盘

Question

我有一个简单的程序，您可以在文本字段中键入文本，点击确定按钮，并使用输入的文本更新标签。

我想要iPhone键盘消失，当我按OK按钮时，当我按下覆盖整个视图的背景中的大按钮，或者当我按下键盘上的返回按钮时。我一直试图使用

[textField resignFirstResponder] 

方法，但它不起作用。程序编译罚款，但是当这种方法是从这些事件中的任何一个调用，它停了，我得到一个消息说：

主题1：信号SIGABRT”

我在做什么？错

#import "ViewController.h" 

    @interface ViewController() 



    @end 

    @implementation ViewController 

    @synthesize txtName; 
    @synthesize lblMessage; 

    - (void)viewDidLoad 
    { 
     [super viewDidLoad]; 
     // Do any additional setup after loading the view, typically from a nib. 
    } 

    - (void)didReceiveMemoryWarning 
    { 
     [super didReceiveMemoryWarning]; 
     // Dispose of any resources that can be recreated. 
    } 

    - (IBAction)doSomething:(UIButton *)sender 
    { 
     [txtName resignFirstResponder]; 

     NSString *msg = [[NSString alloc] initWithFormat:@"Hello, %@", txtName.text]; 
     [lblMessage setText:msg]; 

     //[msg release]; 
    } 

    - (IBAction)makeKeyboardGoAway:(UIButton *)sender 
    { 
     [txtName resignFirstResponder]; 
    } 

    - (BOOL)textFieldShouldReturn:(UITextField *)textField 
    { 
     [textField resignFirstResponder]; 
     return YES; 
    } 

    @end 

这里是头文件，以及：

#import <UIKit/UIKit.h> 

    @interface ViewController : UIViewController 

    @property (weak, nonatomic) IBOutlet UITextField *txtName; 
    @property (weak, nonatomic) IBOutlet UILabel *lblMessage; 

    - (IBAction)doSomething:(UIButton *)sender; 
    - (IBAction)makeKeyboardGoAway:(UIButton *)sender; 
    @end 

那么我得到它的工作，但我仍然不明白我得到的错误信息。 这是我工作的代码。

页眉：

#import <UIKit/UIKit.h> 

@interface ViewController : UIViewController 
{ 
    IBOutlet UITextField *txtName; 
    IBOutlet UILabel *lblMessage; 
} 
@property (nonatomic, retain) IBOutlet UITextField *txtName; 
@property (nonatomic, retain) IBOutlet UILabel *lblMessage; 

- (IBAction)doSomething; 
- (IBAction)makeKeyboardGoAway; 

@end 

实现：

#import "ViewController.h" 

@implementation ViewController 

@synthesize txtName; 
@synthesize lblMessage; 

- (IBAction)doSomething 
{ 
    [txtName resignFirstResponder]; 

    NSString *msg = [[NSString alloc] initWithFormat:@"Hello, %@", 
        txtName.text]; 
    [lblMessage setText:msg]; 
    //[msg release]; 
} 

- (IBAction) makeKeyboardGoAway 
{ 
    [txtName resignFirstResponder]; 
} 

- (BOOL)textFieldShouldReturn:(UITextField *)textField 
{ 
    [textField resignFirstResponder]; 
    return YES; 
} 


- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

@end 

Answer 1

这可能不是resingFirstResponder事情...

尝试：

1. 创建方法南ED takeKeyboardAway：

   -(void)takeKeyboardAway{[sender resingFirstResponder];}

2. ，然后调用它，只要你想要的：

   [self takeKeyboardAway];

Answer 2

这个工程....如果一切行了这一点，可能是别的东西在你的代码....

...也一定要正确链接所有对象（VC到TextField和按钮....按钮返回到VC）...这也可能导致崩溃

.H

@interface ViewController : UIViewController { 

    IBOutlet UIButton *button; 
    IBOutlet UITextField *textfield; 
    IBOutlet UILabel *label; 
    NSString *string; 
} 

-(IBAction)dismiss:(id)sender; 


@property (nonatomic, retain)UIButton *button; 
@property (nonatomic, retain)UITextField *textfield; 
@property (nonatomic, retain)UILabel *label; 

.M

@synthesize textfield, button, label; 

-(IBAction)dismiss:(id)sender { 
[textfield resignFirstResponder]; 
string = [NSString stringWithFormat:@"Hello %@", textfield.text]; 
[label setText:string]; 
} 

Answer 3

调用此方法是单击OK按钮时。

[self.view endEditing:YES];